Crisis year 2020 : analysis of Finnish manufacturing companies’ Twitter activityLähdeaho, Oskari; Hilmola, Olli-Pekka KristianHuman Centred Intelligent Systems : Proceedings of KES-HCIS 2021 Conference2021 / p. 36–45 https://doi.org/10.1007/978-981-16-3264-8_4 Conference Proceedings at Scopus Article at Scopus